.bottom {
    position: fixed;
    bottom: 0;
    left: 0;
    width: 100vw;
    display: flex;
    height: 50px;
    align-items: center;
    border-top: 1px solid #ddd;
    .bottom-item {
        flex:1;
        text-align: center;
    }
    .active{
        color:#ed394a
    }
  }
  .red{
      color:red
  }
  .big{
      font-size:100px
  }
  .top {
      .bottom{
          color:red
      }
  }